Asjignob to lottis schwab



Sept. 4, 1923.

mesm J. J. MCGUCKlN VALVE STEM LENGTHENER Filed May e. 1922 ETE-9.1

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j, 9 I" 13 MW. U 7 14' Patented Sept. 4, i923.

nire stares JOHNJ. MCGUCYKIN, 0F BROOKLYN, NEW YORK, ASSIGNOB. TO LOUISkSCHWAB, 0F

YORK, N. Y., Derive Busrivn i VALVE-STEM Application me@ May e,

To NZZ whom #may concern Be it known that l, JOHN J. MGGUCKIN, a citizenof the United VvStates, residing at Brooklyn, Kings Countyr` New York,have invented certain new and useful Improve-l ments in TValve-StemLengtheners, of which the following is a specification.

My invention relates to means for stretching and thereby lengthening thevalve stems of internal combustion engines, which valve stems have, Yforinstance, become shortened by wear so as not to cooperate properly withthe actuating cams; and my improvements are directed particularly tomeans whereby the stein may be swaged at 'one or more points so as tostretch the stem lengthways to the desired extent and withoutbending ordistorting t-he stemfrom its proper alignnient.

in the drawings Fig. 1 is a longitudinal sectional view ot my improvedtool showing y a valve stemin place therein; and Fig. 2 is an end viewoi" the same lookingto the left on Fig. 1.

Similar parts are designated by similar reference numerals in all thefigures.

The body 1 of the tool has a central longitudinal bore 2 adapted toreceivea valve stem 3 so as to bring it directly between the swagingpistons -l1 5, which slide in boresG and 7 in hubs S and 9` 'formedintegral with the body 1. rlhe pistons are, preferably, prevented 'fromrotating in their sockets'by suitable means, such, for instance, asp-ins 10, 11 projecting from the pistons and traveling in slots 12, 13in the hubs` 8 and 9 respec-V tively. The piston 5 is preferablyprovided with a flange 14 and with a base 15 by which it may be held insuitable supporting means, such as a vise, the jaws of which areindicated by 16, 17 in Fig. 1.

In one end of the body 1 is mounted a gage screw 20, which is threadedthrough one end of the body 1, and which may be screwed out or in to thebody as desired, the gage screw being provided with a suitable milledhead .21 by which it may be conven iently turned. `Y

Between the head 21 and the body-1 l prefer to insert, around the gagescrew 20, a coiled spring Q2 which offers resistance to the turning ofthe head so as to prevent its jarring out of position during the useofthe tool.

In practice the correct length of the valve SS S vSTEVENS & COMITANY.Lnnecrnnnnn.

1522i..v Serial No. i,031. Y

stem ishirst ascertained-by the use otra thi'clmessgage or the like, andthe gage screw 2O is set to mark that length. And the valve stem to belengthened is inserted in the gage and swaged or stretched lengthwaysbetween the pistonsf and 5, by striking piston l with a hammer, so as todrive it down toward 5. It the -swaging is done without adjusting thestem lengthwise, agro'ove or indentation will be formed around the stem,if it is turned slightly vbetween the Yblows on the piston t, such agroove being shown in Fig. 1.

The piston may be stretched at more than one point, by varying thedistance to which it is inserted in the bore of the body. When the stemhas been stretched to the desired eX- tent its end will meet the end of`the gage screw 20, when the head of the stem is against the oppositeend of the body 1. The opening 30 through the body 1 permits therelation of the valve stem and gage screw to be observed.

It will be understood that details ot constructionmaybe modified, by theuse of mechanical equivalents and the like, without departing from thespirit of as claimed. Y

Having thus described my invention, what claim and desire to secure byLetters Patent of the United States is 1. In a valve stem lengthener,the combi-k nation of an anvil, a body carried recipro-V cably therebyand provided with a valve stem supporting portion, and a cooperatinghammer element. i

. 2. In a valve stem lengthener, the combination of an anvil, a bodycarried reciprocably'thereby and provided with a laterally extendedvalve stem supporting portion, and a cooperating hammer element.

'3. In a valve stem lengthener, the combination of an anvil, a bodycarried reciprocably thereby and provided with a valve stem supportingportion and with means for limiting reciprocation in both directions,and a cooperating hammer element.

4. In a valve stem-'lengthener, the c ombination of an anvil', a bodycarried recip-Y rocably thereby and provided with a portionV to maintaina valve stem in a straight line transversely of' the anvil while'beingswedged. Y 5. In a valve Stem lengthener, the combination of a bodyhaving a stem channel -iny invention cooperating means forsimnlteneouslyswaging opposed portions o the valve stein.

7. ln :L valve stein lengthener, the Combination of vmeans for holdingvalve stem against lateral distortion, rneansfor" swag-Y ing one side ofthe valve stein, opposed niezrnsff-or swaging the oppositeside of the-valve stem, and eooperatinfr means disposed in linewith the valvestern, for @aging the extent of the lengthening operation.

JOHN J. MGGUCKIN.

